US791808A - Trial-frame optometer. - Google Patents

Description

. I v v *y No. 791,808. K PATE-MED JUNE 6, 1905,

' J. C. MOALLISTER.

v TRIAL FRAMEOPTOMETER.

APPLIGAHON FILED 0012.22, 1903.

. UNI-TED STATES Patented June 6, 1905.

' PATENT OFFICE.

TRIAL-FRAME 'A OPTOMETER.

SPECIFICATION forming part of Letters PatentNo.' 791,808, dated. J'une 6, 1905.

Application mea october' 22,1903.' serai No. 178,014..

.To a/ZZ whom it may concern:

j Be it known that I, JAMES COOK McALLIs- TER, a citizen of the United States, residing at Media, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Trial-Frame Optometers, of which the following is a specification.

My invention relates to an improved trialframe optometer in which a series of lenses of different foci are. mounted upon a revoluble disk, so that each lens may bel brought consecutively before the eye of the patient for the purpose of testing or examining the eyesight.

The object of my invention is to construct an optometer which may be used in connection with a trial-frame and vreadily placed in either rim of said trial-frame or shifted from one to the other of said rims.

A further object of my invention is to provide a diaphragm which will be held between the patients eye and the lens-disk, so that but one lens may be seen through the aperture in said diaphragm.V

A still further object is to, provide a handle by which the instrument may be held in its proper place on the trial-frame and more vreadily changed from one to the other of the rims of said trial-frame.

A still further object of my invention is to construct a trial-frame which is particularly adapted to receive said optometer.

Referring to the drawings, Figure 1 repre-I sents a front view of the optometer resting in one of the runs of a trial-frame. F1g. 2 represents a rear view of the same. Fig. 3 is a sectional view as on line 3 3, Fig. 2. Fig. 4:

is a front view of the optometer, showing a trial-frame particularly constructed to receive the optometer. Fig. 5 is a sectional view as on line 5 5,` Fig. 4.

In the drawings, A representsfthe trial-J frame having rims A and A2, connected by a nose-piece A2. Attached to either rim is a temple a. The rims A and A2 are U shape in cross-section, as shown in Fig. 3.

-dle E, washers e being placed at either side of said handle to keep the same from touching the disk D or diaphragm B. y

As shown in Fig. 2, the disk D is provided with depression d', arranged adjacent to each lens. A spring F, having a projection f, is

secured to the diaphragm B, and when any one lens is brought into alinement with the aperture 5 the projection f on the spring will enter the depression 0l' and tend to keep the diskfrom revolving.

The optometer may readily be removed from the rim A2 by means of the handle E and placed in the rim A, the handle E being turned to the opposite side of the optometer before the same is placed in the opposite rim, so that said handle will not touch the patients face. The diaphragm B may be rotated in the rim sufliciently to keep thev inner edge of the disk D away from patients nose, as shown in Figs. l and 2.

Fig. 4: illustrates a trial-frame in which the diaphragms Gr and G are made part of the trial-frame and the rims shown in Fig. 1 are vdispensed with. A nose-piece g connects said diaphragms, and' temples g are also attached to said diaphragms.` Each diaphragm is provided with an aperture G2 and a slot g4, into which is inserted the pin C', as shown in Fig. 5. The pin C is provided with a nut C2. Suiiicient space is left on the pin C between the nut C2 and the shoulder C2 to allow said pin to be dropped into the slot g4g on the dia# phragms, so that the pin carrying the lens-disk may readily be changed from one diaphragm 7 phragms are held rigidly, and it is therefore not necessary to use a handle to steady the optometeras it is Where the diaphragm is simply dropped into the rims of the trialframe, as shown in Figs. 1 and 2.

Havingthus described my invention, Iclaim and desire to secure by Letters Patent- 1. In an optometer, the combination of a disk having a plurality of lenses, a diaphragm having an aperture formed therein, and a trialframe'adapted to hold said diaphragm, substantially as described.

2. In an optometerthecombination of a disk having a plurality of lenses, a diaphragm having an aperture formed therein, a trial-frame having rims, a semicireular portion on said diaphragm adapted to fit into the rims of said trial-frame, substantially as described.

3. The combination of a disk having a plurality of lenses, a pin upon which said disk is revolubly mounted, a trial-frame having diaphragms, and means of attaching said pin to said diaphragm so that said disk Will be interchangeable, substantially as described.

4. The combination of a disk having a pluralitylof lenses, a pin carrying the` same, diaphragms forming a part of a trial-frame, said diaphragms being provided with slots to receive the pin carrying said disk, substantially as described.

5. In an optometer the combination of a disk having a plurality of lenses, a pin on which said disk is mounted, a diaphragm carrying said pin and a handle loosely mounted on said pin, substantially as described.

6. In an optometerthe combination of a diaphragm having an aperture formed therein, a pin carried by said diaphragm, a disk mounted on said pin, a plurality of lenses carried by said disk, and a spring adapted to hold said disk in proper relation with the said diaphragm, substantially as described.

V7. In an optometer, the combination of adiaphragm having au aperture formed therein, a pin carried by said diaphragm, a disk mounted on said pin, a plurality of lenses in said disk, a handle pivoted on said pin, washers on either side of said handle and a spring carried by said diaphragm adapted to bind against said disk, substantially as described.

In testimony whereof I afiix my signatu re in presence of two Witnesses.

JAMES COOK MCALLISTER.

Witnesses:

E. D. PATTERSON, F. H. VOODHEAD.

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